The expression for the Rankine’s crippling load is given as________.

A

$$P = \frac{\sigma_c A}{1 - K \left(\frac{l_e}{K}\right)^2}$$

B

$$P = \frac{\sigma_c A}{1 + K \left(\frac{l_e}{K}\right)^2}$$

C

$$P = \frac{\sigma_c A}{1 - 2K \left(\frac{l_e}{K}\right)^2}$$

D

$$P = \frac{\sigma_c A}{1 + 2K \left(\frac{l_e}{K}\right)^2}$$